<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script>
			var str="大招好，我是渣渣灰";
			for(var i in str){
				alert(i+":"+str[i]);
			}
		</script>
	</head>
	<body>
	</body>
</html>